Xamarin.iOS-自定义UIPopoverBackgroundView

Question

I need to implement a custom popover for iOS 6+ using Xamarin.iOS.

So far, everything is working except turning off the default shadow. Here is my implementation:

    public class PopoverBackgroundView : UIPopoverBackgroundView
    {
        private UIImageView _arrow, _background;

        public override float ArrowOffset { get; set; }

        public override UIPopoverArrowDirection ArrowDirection { get; set; }

        [Export ("arrowHeight")]
        static new float GetArrowHeight()
        {
            return 39;
        }

        [Export ("arrowBase")]
        static new float GetArrowBase()
        {
            return 80;
        }

        [Export ("contentViewInsets")]
        static new UIEdgeInsets GetContentViewInsets()
        {
            return new UIEdgeInsets (25, 25, 25, 25);
        }

        [Export("wantsDefaultContentAppearance")]
        static new bool WantsDefaultContentAppearance
        {
            get { return false; }
        }

        public PopoverBackgroundView(IntPtr handle) : base (handle)
        {
            _background = new UIImageView { Image = Theme.PopoverBackgroundImage };
            _arrow = new UIImageView { Image = Theme.PopoverArrowImage };

            AddSubview(_background);
            AddSubview(_arrow);
        }

        public override void LayoutSubviews()
        {
            base.LayoutSubviews();

            var arrowFrame = new RectangleF(Frame.Width - GetArrowBase(), -14, GetArrowBase(), GetArrowHeight());
            _arrow.Frame = arrowFrame;

            var backgroundFrame = Frame;
            backgroundFrame.X = 
                backgroundFrame.Y = 0;
            _background.Frame = backgroundFrame;
        }
    }

This class is pretty weird, because you have to "override" static Objective-C values. The only way to do this in C# is declaring a static new member and adding the Export attribute.

Everything is working except for WantsDefaultContentAppearance , which is never called. According to Apple documentation here , it will disable the default shadow on the popover. Has anyone gotten this to work with Xamarin.iOS? I think it could possibly be a Xamarin bug since all the methods work fine, and this one happens to be a property. The methods in this class seem to be defined as methods "on purpose" in this class, since they would look a lot prettier as properties.

Answer 1

I don't think this is a Xamarin bug, but the iOS APIs were just not working for me.

To fix this, my designer took his shadow off the images and we just kept the default shadow.

Honestly, I think this is better anyway, because Apple took the time to make a pretty shadow--why remove it?